Time to conception and the menstrual cycle: an observational study of fertility app users who conceived.
Journal: 2019/May - Human Fertility
ISSN: 1742-8149
The objective of this research was to evaluate the association between menstrual cycle characteristics (cycle length, cycle-length variability, and their interaction) and the amount of time it takes women to conceive using a robust multiple linear regression. Participants downloaded Ovia Fertility in 2015 indicated that they had just started trying to conceive, and reported conception within 12 months (n = 45,360, adjusted model n = 8835). The average time to conception among women in the adjusted model was 3.94 months (n = 8835). Women with normal cycle lengths (27-29 days) conceived more quickly than women with cycle lengths of 25-26 days (+0.41 months; p < 0.001), 30-31 days (+0.27 months; p < 0.01), 32-33 days (+0.44 months; p < 0.001), and 34+ days (+0.75 months; p < 0.001). Women with regular cycle-length variability (<9 days between cycles) conceived more quickly than women with irregular variability (+0.72 months; p < 0.001). Results of the interaction analysis indicated that, among women with regular cycle-length variability, those with normal cycle length had shorter time to conception than women with either short or long cycle length. The interaction between cycle length and cycle-length variability provided enhanced insights into the amount of time it takes to conceive, compared to either indicator alone.
Similar articles
Articles by the same authors
Discussion board
Collaboration tool especially designed for Life Science professionals.Drag-and-drop any entity to your messages.